1992857 has 4 divisors (see below), whose sum is σ = 2046756. Its totient is φ = 1938960.

The previous prime is 1992841. The next prime is 1992877. The reversal of 1992857 is 7582991.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1819801 + 173056 = 1349^2 + 416^2 .

It is a cyclic number.

It is not a de Polignac number, because 1992857 - 2⁴ = 1992841 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1992817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26894 + ... + 26967.

It is an arithmetic number, because the mean of its divisors is an integer number (511689).

2^1992857 is an apocalyptic number.

It is an amenable number.

1992857 is a deficient number, since it is larger than the sum of its proper divisors (53899).

1992857 is an equidigital number, since it uses as much as digits as its factorization.

1992857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53898.

The product of its digits is 45360, while the sum is 41.

The square root of 1992857 is about 1411.6858715734. The cubic root of 1992857 is about 125.8419324660.

The spelling of 1992857 in words is "one million, nine hundred ninety-two thousand, eight hundred fifty-seven".